Hello,
Could you help to install the ST timer on the AT91Rm9200? I don't know how to setup the AIC registers correct. Maybe there are more than one big mistake.
void initialize_pit() { unsigned int flag, period, irq_id, mask, oldHandler, src_type, priority; volatile int status; void *newHandler; //period Timer0->ST_PIMR = period << 5; AT91F_ST_SetPeriodInterval(Timer0, period); //state //status = Timer0->ST_SR; //enable interrupt flag=1; Timer0->ST_IER = flag; AT91F_ST_EnableIt( Timer0, flag); //enable PMC AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, 1 << AT91C_ID_IRQ0); //config AIC irq_id = 0; oldHandler = pAic->AIC_SVR[irq_id]; mask = 0x1 << irq_id; pAic->AIC_IDCR = mask ; pAic->AIC_SVR[irq_id] = (unsigned int) newHandler ; //* Store the Source Mode Register pAic->AIC_SMR[irq_id] = src_type | priority ; AT91F_AIC_ConfigureIt(pAic, irq_id, priority, src_type, newHandler); //enable AIC AT91F_AIC_EnableIt(pAic, 1); }
I hope somebody could help me with this problem...
best regards johannes
AT91F_AIC_ConfigureIt(pAic, irq_id, priority, src_type, ST_interrupt);
src_type and priority don't have any values assigned to them !
I'm pretty sure that the compiler is issuing warnings about variables being used before having been assigned a value here. Compiler warnings are there for a reason and usually indicate that there is a problem with your code.
void ST_interrupt(void) { AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF; //disable all interrupts AT91C_BASE_AIC->AIC_ICCR = 0x00000001;
This is unnecessary and useless at best. Since you probably want the ST interrupt to be level-sensitive, the AIC_ICCR will have no effect. The interrupt will be cleared by reading ST_SR instead.